if we don't know who the competitors are? Basic logic, you know!
see the faqs
Advertising & Other Site Links
Putting links advertising websites (eg. New Mainframe or Job sites) or linking to auction websites is strictly forbidden. Please inform to the site Admin, before posting links to other mainframe forums. Signature links to your own websites must be made in Text format which can be set in your profile.
Feel free to ask the moderators before posting the downloaded materials from other sites..
here ( this forum )
and here http://ibmmainframes.com ( brother forum )
other mainframe forums are considered competitors
but the feeling is reciprocated
the link You posted is just borderline
since these sites make a living on advertising, and the <revenue> is based on the number of hits,
no reason to make a present of hits to a <competitor>
even more basic logic, You know!
mailing lists ( IBMMAIN for example ) hosted on education facilities are not considered competitors ( generally )